期刊
ADVANCED MATERIALS
卷 34, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106826
关键词
ferroelectric domains; free-standing membranes; microtubes; strain engineering
类别
资金
- Swedish Research council [2018-07152]
- Swedish Governmental Agency for Innovation Systems [2018-04969]
- Formas [2019-02496]
- EPSRC [EP/S010769/1]
- Chinese Scholarship Council
- Czech Science Foundation [19-28594X]
- SFI Industry Fellowship [18/IF/6282]
- Royal Society University Research Fellowship [URF-R1-201318]
- Netherlands Organization for Scientific Research (NWO/OCW) [016.Vidi.189.061]
- EU [707404]
- Society of Chemical Industry
- Ramsay Memorial Trust
The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers possibilities for inducing new phases and enhanced electrical properties. By releasing the mechanical constraint imposed by the substrate, the balance between elastic and electrostatic forces can be altered, activating new mechanical degrees of freedom and resulting in the formation of curved heterostructures.
The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, and enhanced electrical properties. However, the dominant effect of substrate clamping can also limit the electromechanical response and often leaves electrostatics to play a secondary role. Releasing the mechanical constraint imposed by the substrate can not only dramatically alter the balance between elastic and electrostatic forces, enabling them to compete on par with each other, but also activates new mechanical degrees of freedom, such as the macroscopic curvature of the heterostructure. In this work, an electrostatically driven transition from a predominantly out-of-plane polarized to an in-plane polarized state is observed when a PbTiO3/SrTiO3 superlattice with a SrRuO3 bottom electrode is released from its substrate. In turn, this polarization rotation modifies the lattice parameter mismatch between the superlattice and the thin SrRuO3 layer, causing the heterostructure to curl up into microtubes. Through a combination of synchrotron-based scanning X-ray diffraction imaging, Raman scattering, piezoresponse force microscopy, and scanning transmission electron microscopy, the crystalline structure and domain patterns of the curved superlattices are investigated, revealing a strong anisotropy in the domain structure and a complex mechanism for strain accommodation.
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